It probably just hurts because you are not used to riding with that harness, meaning the torso gets a better workout when using a waist harness since the center of gravity is your torso, not your hips. I might get it wrong, but it seems normal.

I have both. I use the waist when in the surf, if on flat water doing this and that...but when I'm doing an all out boost session on the edge, the seat harness comes out. Spreads the load across your hips and torso. When I do this session on the waist I can actually tear stomach muscles, no probs on the seat.

Westozzy wrote:I have both. I use the waist when in the surf, if on flat water doing this and that...but when I'm doing an all out boost session on the edge, the seat harness comes out. Spreads the load across your hips and torso. When I do this session on the waist I can actually tear stomach muscles, no probs on the seat.

So yes, hence why you may be having the sore stomach muscles.

i'm also doing exactly like you and it works perfect for me too. I can't hold as much power when riding with my waist so for big jump I still prefer my Mystic Force Shield harness but for free riding and with the surf board I prefer the feeling of the waist.

But the pain will fade out slightly every session, new muscles are working

Westozzy wrote:I have both. I use the waist when in the surf, if on flat water doing this and that...but when I'm doing an all out boost session on the edge, the seat harness comes out. Spreads the load across your hips and torso. When I do this session on the waist I can actually tear stomach muscles, no probs on the seat.

So yes, hence why you may be having the sore stomach muscles.

i'm also doing exactly like you and it works perfect for me too. I can't hold as much power when riding with my waist so for big jump I still prefer my Mystic Force Shield harness but for free riding and with the surf board I prefer the feeling of the waist.

But the pain will fade out slightly every session, new muscles are working

Yeh a freeride boost session off ocean ramps on a 10m edge in 20 knots plus jumping twice on the way out and twice on the way in over a couple of hours would tear my abs to shreds on a waist. Reckon I got close to a hernia a few times!